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Update of NIST half-life results corrected for ionization chamber source-holder instability
Institution:1. European Commission, Joint Research Centre, Radionuclide Metrology Sector, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, BELGIUM;2. ENEA, National Institue Ionizing Radiation Metrology, C.R. Casaccia, Via Anguillarese, 301, 00123 S. Maria di Galeria, Rome, ITALY;3. Federal Office of Metrology and Surveying, Ionising Radiation and Radioactivity, Arltgasse 35, 1160, Vienna, AUSTRIA;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada;2. National Superconducting Cyclotron Laboratory Michigan State University, East Lansing, MI 48824, USA;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;3. Horia Hulubei National Institute of Physics and Nuclear Engineering, IFIN-HH, Magurele 077125, Romania;4. Doctoral School of Physics, University of Bucharest, Bucuresti-Magurele 077125, Romania;5. Joint department for nuclear physics, Lanzhou University and Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;6. Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;7. Idaho National Laboratory, Idaho Falls, ID 83415, USA;8. Department de Física Nuclear, Instituto de Física da Universidade de São Paulo, São Paulo, Brazil;9. Department of Physics, Tohoku University, Sendai 980-8578, Japan;10. Research Center for Electron Photon Science, Tohoku University, 1-2-1 Mikamine, Sendai 982-0826, Japan;11. RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Saitama 351-0198, Japan;12. China Institute of Atomic Energy, Beijing 102413, China;13. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA;14. Extreme Light Infrastructure-Nuclear Physics, RO-077125, Magurele, Romania
Abstract:As reported at the ICRM 2011, it was discovered that the source holder used for calibrations in the NIST 4πγ ionization chamber (IC) was not stable. This has affected a large number of half-life measurement results previously reported and used in compilations of nuclear data. Corrections have been made on all of the half-life data based on the assumption that the changes to the ionization chamber response were gradual. The corrections are energy dependent and therefore radionuclide specific. This presentation will review our results and present the recommended changes in half-life values and/or uncertainties.
Keywords:Half-life measurement  Ionization chamber  Calibrations
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